To enjoy comfortable fishing with approval and acceptance by using a method which is the best for mooring a boat to a culturing plant where fishes are easily gathered at deep positions and no need exists for an anchor during boat fishing on a water surface and which is easier than a conventional method for giving no trouble to a plant owner.

In a simple method using one armed mooring device for quickly removing a facility rope from the boat, the facility rope is tied to the boat at a certain space to prevent a trouble between a fishing line and the underwater culturing plant.